Shi Chengyu, Li Nan, Yuan Qisong, Liu Tao, Cao Qingyuan, Qian Hanqi, Jiang Bo, Wang Jiazhi, Yu Xiangtao
{"title":"POSS-reinforced covalent network in epoxy adhesive and its improvement in the high-temperature adhesion, toughness, and transparency","authors":"Shi Chengyu, Li Nan, Yuan Qisong, Liu Tao, Cao Qingyuan, Qian Hanqi, Jiang Bo, Wang Jiazhi, Yu Xiangtao","doi":"10.1002/app.56300","DOIUrl":"10.1002/app.56300","url":null,"abstract":"<p>Developing epoxy structural adhesives with excellent high-temperature adhesion remains a great challenge. The incorporation of fillers can enhance the performance of epoxy adhesives, albeit at the expense of reduced high-temperature adhesion properties. Polyhedral oligomeric silsesquioxanes (POSS) is considered a promising filler for enhancing high-temperature adhesion properties due to its excellent compatibility and nano cage-structured. Herein, the rigid cage-structured was covalently introduced epoxy adhesives to improve the high-temperature adhesion properties. The introduction of 1 wt% POSS significantly increased the high-temperature (120°C) adhesion strength by 197% and toughness by 283%. The POSS-reinforced adhesive also featured excellent wide temperature adaptability, indicating that it maintained high adhesion strength at various temperatures. Furthermore, POSS drastically enhanced the transparency of epoxy adhesive by three times. It is highly anticipated that this work will open a new avenue of designing epoxy adhesives with the excellent high-temperature adhesion properties and transparency.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 48","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kyeong-Jung Kim, Ji-Hoon Kang, Se-woon Choe, Yeon-Hum Yun, Soon-Do Yoon
{"title":"Synthesis, recognition properties and drug release behavior of diltiazem-imprinted chitosan-based biomaterials","authors":"Kyeong-Jung Kim, Ji-Hoon Kang, Se-woon Choe, Yeon-Hum Yun, Soon-Do Yoon","doi":"10.1002/app.56307","DOIUrl":"https://doi.org/10.1002/app.56307","url":null,"abstract":"In this study, we prepared diltiazem (DTZ)-imprinted biomaterials for TDDS using chitosan, PVA, plasticizers, and sulfosuccinic acid. DTZ and the prepared biomaterials were characterized using field emission scanning electron microscopy, Fourier transform infrared, and <sup>1</sup>H nuclear magnetic resonance. DTZ recognition properties were confirmed by the binding isotherm, Scatchard plot analysis, the adsorption of materials with structures similar to DTZ, selectivity factor (<i>α</i>), and the imprinting-induced promotion of binding (IPB). Results revealed that adsorbed amount (Q) of DTZ-imprinted biomaterials was 1.63–2.53 times higher than that of non-imprinted biomaterials. In addition, it could be verified that DTZ-imprinted biomaterials have a binding site for DTZ according to Scatchard plot analysis. Furthermore, the results of <i>α</i> and IPB indicated that the recognition capacity of the prepared DTZ-imprinted biomaterials is superior to that non-imprinted biomaterials. DTZ release properties were evaluated under various pH buffers and artificial skin. Results indicated that the DTZ release in buffers at low pH was faster than that in buffers at high pH. The DTZ release using artificial skin was continuous over 20 days. Furthermore, the DTZ release profile in the buffer followed the pseudo-Fickian diffusion mechanism, whereas the profile in the artificial skin test followed a non-Fickian diffusion mechanism.","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"19 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Salhah D. Al-Qahtani, Yasser A. Attia, Ghadah M. Al-Senani
{"title":"Development of biochromic paper strips from cellulose nanocrystals and anthocyanin extract from pomegranate (Punica granatum L.) for colorimetric determination of urea","authors":"Salhah D. Al-Qahtani, Yasser A. Attia, Ghadah M. Al-Senani","doi":"10.1002/app.56284","DOIUrl":"10.1002/app.56284","url":null,"abstract":"<p>An anthocyanin (ACN) spectroscopic probe was extracted and immobilized into a matrix of cellulose nanocrystals (CNC)/urease enzyme to create a colorimetric nanocomposite film sensor. The ACN@CNC composite is a disposable molecular biosensor that uses urease as a catalyst, ACN as a molecular probe, and CNC as a probe carrier with a high surface area. The ACN spectroscopic probe was isolated from the pomegranate peel (<i>Punica granatum</i> L.). A mordant was applied to fix ACN onto CNC by forming nanoparticles (6–14 nm) of mordant/ACN (M/ACN) complexation. CNC showed diameters in the range of 11–21 nm, and crystal lengths of 55–130 nm. Under acid/base conditions, the ACN probe solution in distilled water exhibited a reversible color change, as shown by the UV–Vis absorption spectra. In order to create a biocomposite film, CNC were reinforced with a sodium alginate biopolymer. Upon exposure to urea in an aqueous solution, the ACN@CNC film biosensor changes color from purple (598 nm) to white (432 nm). The detection limit of urea was determined at 25–450 ppm. Various methods were utilized to investigate the morphological properties of CNC and ACN@CNC films.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 48","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Esra Yaşar, Hilal Özçelik, Timuçin Güner, Emre Dokuzparmak, Sinan Akgöl
{"title":"Molecular imprinting based sensor system developed using polymeric nanoparticles for detecting 17β-estradiol in agricultural wastewater","authors":"Esra Yaşar, Hilal Özçelik, Timuçin Güner, Emre Dokuzparmak, Sinan Akgöl","doi":"10.1002/app.56276","DOIUrl":"10.1002/app.56276","url":null,"abstract":"<p>Micro pollutants pose a significant issue in water ecosystems. Particularly high concentrations of 17β-estradiol (E2) have been identified in agricultural wastewater, which poses harmful effects on aquatic organisms and disrupts ecosystem balance. Therefore, effective determination of E2 from water sources is crucial. This study developed a biosensor capable of detecting E2 in wastewater using specific polymer nanoparticle synthesis through molecular imprinting. Est-imp-poly(multi-walled carbon nanotubes-glycidyl methacrylate [MWCNT-GMA]) polymer nanoparticles were synthesized using a surfactant-free emulsion polymerization method, and their characterization was conducted using FTIR and scanning electron microscopy (SEM) technologies. The <i>Q</i><sub>max</sub> value for Est-imp-poly(MWCNT-GMA) nanoparticles in a 1 mg/mL E2 solution was determined to be 140 ppm. Comparing adsorption capacities, the molecularly imprinted nanoparticles (MIP) showed nearly five times higher E2 adsorption compared to non-imprinted polymers (NIP). The Est-imp-poly(MWCNT-GMA)-Nafion/screen-printed electrode (SPE) system was employed for analyzing wastewater samples. The current measurements taken at various concentrations in the wastewater consistently matched the E2 concentration calibration curve. The limit of detection (LoD) and limit of quantification (LoQ) were determined to be 0.042 and 0.12 μM, respectively. The biosensor demonstrated a linear working range from 0.12 to 50 μM, with a high correlation coefficient (<i>R</i><sup>2</sup> = 0.9927). These results highlight the potential of the developed biosensor for detecting E2 in real samples.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/app.56276","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Constituent compatibility and physical properties of bio-based EUG/EPDM blends","authors":"Yunyi Yang, Shang Chen, Youji Li, Zhaoxia Yang, Zhangying Han, Haiqin Xia, Jiawei Shang, Yunzhe Shao","doi":"10.1002/app.56299","DOIUrl":"10.1002/app.56299","url":null,"abstract":"<p><i>Eucommia ulmoides</i> gum (EUG)/ethylene propylene diene monomer (EPDM) blends were prepared using EUG with high and low molecular weight, respectively, and their physical properties and constituents compatibility were investigated. The blend exhibited superior physical properties and constituents compatibility when EUG with high molecular weight occupied 10 wt%. When its content increased further, the physical properties deteriorated gradually,the results of SEM, DSC, and DMA diagrams indicated poorer constituents compatibility. The blends prepared from EUG with low molecular weight can achieve better compatibility in a comprehensive range of blending ratio. When the EUG content was 20 wt%, the maximum tensile strength of the blend was observed, which was 49.9% higher than that of pure EPDM, its rebound resilience ascended by 5%, and the wear resistance remained nearly unchanged.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 48","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Tailoring N, N, N-trimethyl chitosan nanospheres as an efficient drug carrier to overcome endothelial barrier","authors":"Chao Lu, Howyn Tang, Jianying Ouyang, Jin Zhang","doi":"10.1002/app.56278","DOIUrl":"10.1002/app.56278","url":null,"abstract":"<p>Endothelial barriers, integral components of tissue barriers, are densely packed with adherens junction and tight junction proteins, hindering the passage of drugs to target sites. Herein, a novel nanosphere comprising <i>N</i>, <i>N</i>, <i>N</i>-trimethylated chitosan (TMC), with the size of 51 ± 8 nm and zeta potential of 13.2 ± 5.3 mV, has been engineered as a drug carrier to facilitate the transport of hydrophobic drugs, that is, curcumin, across endothelial barriers efficiently. The effects of pH value and temperature on the release kinetics of curcumin from TMC nanospheres have been studied. In addition, the transportation of TMC nanospheres across an in vitro endothelial barrier was evaluated over a 72-h period. The integrity of the in vitro endothelial barrier was assessed before and after the transport of TMC nanospheres by using transepithelial electrical resistance measurements and immunofluorescence staining of tight junction proteins. The results reveal that TMC nanospheres significantly enhance the transport of curcumin across the endothelial barrier, with approximately 30% of curcumin released as compared to less than 3.3% across the barrier without the assistance of TMC nanospheres. This investigation underscores the potential of small-sized TMC nanospheres to enhance the transport of hydrophobic drugs across endothelial barriers.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 48","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Preparation of magnetic scaffolds via supercritical carbon dioxide foaming process using iron oxide nanoparticles coated with CO2-philic materials as nucleating agents","authors":"Zhen Jiao, Shuo Zhang, Jinjing Wang, Yi Zhang","doi":"10.1002/app.56256","DOIUrl":"10.1002/app.56256","url":null,"abstract":"<p>The iron oxide nanoparticles (IONs), coated with different materials, are synthesized and utilized as nucleating agents to prepare magnetic multi-modal porous scaffolds of poly (lactic-<i>co</i>-glycolic acid)/IONs using the supercritical carbon dioxide (ScCO<sub>2</sub>) foaming process. The effects of the modification materials, including citric acid, polycaprolactone, and polyvinyl acetate, on the foaming process and properties of the magnetic scaffolds are systematically investigated. The results indicate that the solubility and diffusion ability of CO<sub>2</sub> in the foaming materials played a vital role in the foaming process. The use of CO<sub>2</sub>-philic materials and high pressure proves beneficial in generating micropores. The scaffolds with multi-modal porous structures can be obtained at relatively low pressure for the ScCO<sub>2</sub> foaming systems evaluated in this study. Furthermore, the prepared scaffolds exhibit high porosity and a good compressive modulus (higher than 0.4 MPa), satisfying the requirements of tissue engineering for soft tissue scaffolds.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Murtaza Haider Syed, Md Maksudur Rahman Khan, Mior Ahmad Khushairi Mohd Zahari, Mohammad Dalour Hossen Beg, Norhayati Abdullah
{"title":"Optimization of solvent system for chitosan/polylactic acid/nanocellulose nanofibers using needleless electrospinning","authors":"Murtaza Haider Syed, Md Maksudur Rahman Khan, Mior Ahmad Khushairi Mohd Zahari, Mohammad Dalour Hossen Beg, Norhayati Abdullah","doi":"10.1002/app.56291","DOIUrl":"10.1002/app.56291","url":null,"abstract":"<p>Needless electrospinning (NES) is the most advanced and robust method to generate biopolymeric nanofibers. NES overcomes the needle clogging and low throughput issues of conventional needle based electrospinning (ES). However, the issue with all ES techniques is the absence of generalized methods in the literature, and most of the work is being done empirically. The solvent system dictates the feasibility of the ES process, and solvent system based studies can help create more generalized ES methods. The current work provides a systematic approach to fabricating tribiopolymeric nanofibers. NES was used to fabricate chitosan (CS)/polylactic acid (PLA)/nanocellulose (NCC) based nanofibers by optimizing the solvent system using dichloromethane (DCM) and trifluoroacetic acid (TFA). Biopolymeric blend PLA/CS/NCC (10:0.1:0.05 w/v %) in various formulated solvent systems were made and analyzed for their physical properties (sedimentation rate, particle size, viscosity, and surface tension) and subjected to NES. The binary solvent system SS91 (DCM (90):TFA (10) %) showed the lowest sedimentation rate and viscosity while the highest particle size and surface tension, resulting in the beads free nanofibers. The viscosity and surface tension comparison were used to determine a critical point for the feasibility of nanofiber fabrication. Overall, the study showed a systematic approach for fabricating complex tri-biopolymeric nanofibers in future.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 48","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hao Wu, Dengwang Lai, Mengyao Nan, Wuyan Cao, Li Liu, Yuejun Liu, Jun Yang
{"title":"Flame retardant polyvinyl alcohol film with self-releasing carbon dioxide and ammonia from phytic acid and urea","authors":"Hao Wu, Dengwang Lai, Mengyao Nan, Wuyan Cao, Li Liu, Yuejun Liu, Jun Yang","doi":"10.1002/app.56258","DOIUrl":"10.1002/app.56258","url":null,"abstract":"<p>This paper utilizes the reaction of phytic acid (PA) and urea (UM) in polyvinyl alcohol (PVA) solution to synthesize flame retardant gasses (CO<sub>2</sub>, NH<sub>3</sub>) for the preparation of PVA composite films containing flame retardant microbubbles. The flame retardancy of PVA composite films was assessed using methods including limiting oxygen index (LOI), vertical burning (UL 94), and cone calorimetry. The results indicated an increase in the LOI of the PVA composite film containing flame retardant microfoam from 20% to 30% compared with the pure PVA film, and that UL 94 reached VTM-0. Furthermore, its peak exothermic rate and total exothermic amount were reduced by 36.25% and 38.92%, respectively, compared with the pure PVA film. The investigation of the flame-retardant mechanism employed thermogravimetric-infrared (TG-IR), scanning electron microscopy (SEM), Raman spectroscopy, and infrared spectroscopy. The results demonstrate that the CO<sub>2</sub> and NH<sub>3</sub> flame retardant microbubbles within the composite film render it less ignitable at the initial stage, and that the internal UM of the composite film continues to decompose, releasing CO<sub>2</sub> and NH<sub>3</sub> upon heating. In addition, the acidic substances decomposed by PA during combustion promote the dehydration, cross-linking, and cyclization of PVA, generating chemical structures such as P<span></span>O<span></span>C, P<span></span>O<span></span>P, and PO<sub>4</sub> with enhanced thermal stability. This encourages the formation of a continuous, dense charcoal layer and impedes the transfer of oxygen and heat into the interior.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Catalytic pyrolysis upcycling of waste thermosetting epoxy resin into fire-retardant additive","authors":"Roya Mahmoodi, Omid Zabihi, Mojtaba Ahmadi, Mahmoud Reza Ghandehari Ferdowsi, Minoo Naebe","doi":"10.1002/app.56271","DOIUrl":"10.1002/app.56271","url":null,"abstract":"<p>This research introduces a low-temperature catalytic-assisted pyrolysis method for recycling waste thermosetting epoxy resins, transforming them into an efficient fire-retardant additive for new epoxy resin formulations. In this study, we demonstrate that boric acid (BA) can significantly reduce the temperature required for epoxy resin (EP) pyrolysis, resulting in degradation products containing boron atoms that can act as a fire-retardant additive. The impact of 5%–20% content of recycled EP (R-EP) on the curing process, thermal stability, fire retardancy, and mechanical properties of the new EP was comprehensively investigated. The TGA results show that adding BA to epoxy resin at a 1:4 BA:EP ratio significantly reduces pyrolysis temperature. Neat EP degrades in two stages in 341°C and 557°C, while EP with BA degrades in three stages, starting below 120°C and peaking around 142°C. The results demonstrated an outstanding effect of incorporating 20% R-EP on the char formation and fire retardancy of the new EP, surpassing the performance of 20% triphenyl phosphate (TPP), a commercially available fire retardant. The storage modulus for neat EP is 1510 MPa, increasing to 2280 MPa with EP/R-EP 20%, indicating enhanced rigidity. Addition of R-EP raised glass transition temperature (<i>T</i><sub>g</sub>) of the epoxy resin up to 38°C, indicating highly cross-linked structures compared to TPP-modified EP, which shows lower <i>T</i><sub>g</sub> values.</p>","PeriodicalId":183,"journal":{"name":"Journal of Applied Polymer Science","volume":"141 47","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/app.56271","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}